Glass
Basics- Hard, brittle
Soda-lime glass
Process
-It is prepared by melting the raw materials. Eg. Such as sodium carbonate (soda), lime, dolomite, silicon dioxide (silica), aluminium oxide (alumina), and small quantities of fining agents in a glass furnace at temperatures locally up to 1675 degree Celsius.
-It is usually composed of 60-75% silica, 12-18% soda and 5-12% lime.
-It is process in two different methods such as float process for windows, blowing and pressing for container glass.
Technical information
-It has light transmission appropriate to be use in flat glass in windows.
-It has a smooth and nonporous surface.
-It is virtually inert and resistance to chemical attack.
-When glass is cut and has no edgework it is referred to as, clean cut. Clean cut glass is used whenever the glass is installed in a frame and sharp edges are not exposed.
Limitations
-Can withstand the glass transition temperature for window at 564 degree Celsius.
-Hardness (Mohs scale) : 6
-Can be turn into any shape.
-Common use =3/32″- single strength (SS); for windows & picture frames.
1/8″ - double strength (DS); for windows & picture frames.
3/16″- for windows, small table tops .
1/4″ - for table tops, shelving.
3/8″ - heavy glass; for table tops, shelving.
1/2″ - heavy glass; for table tops, shelving.
3/4″ - heavy glass; for table tops, shelving.
1/8″ - double strength (DS); for windows & picture frames.
3/16″- for windows, small table tops .
1/4″ - for table tops, shelving.
3/8″ - heavy glass; for table tops, shelving.
1/2″ - heavy glass; for table tops, shelving.
3/4″ - heavy glass; for table tops, shelving.
Usage
-Used in residential window panes and glass bottles.
-Load-bearing structural glass.
-Modern glass art and light bulbs.
Environmental impact
-It uses common, easy to extract materials, the production process does not generate much waste, and the recycling ratios of glass are one of the highest of all materials.
Advantages
-It is the least expensive type of glass and most commonly use and reusable.
Disadvantages
-It is dangerous if it breaks. It might hurt as it turns into jagged shards.
-Easily loss of strength compare to tempered glass.
-It is not resistant to sudden temperature changes or high temperatures.
Company in Australia
Reference
-Materials for architectural design, By Victoria Ballard Bell with Patrick Rand
-http://www.lenntech.com/glass.htm
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